From the Document: "The trade practices of U.S. trading partners and the U.S. trade deficit are a focus of the Trump Administration. Citing these and other concerns, the President has imposed tariffs under three U.S. laws that allow the Administration to take such action: (1) Section 201 (Table 1) on U.S. imports of washing machines and solar products; (2) Section 232 (Table 2) on U.S. imports of steel and aluminum, and potentially autos, uranium, and titanium sponge; and (3) Section 301 (Table 3) on U.S. imports from China. Congress delegated aspects of its constitutional authority to regulate foreign commerce to the President through these trade laws. These statutory authorities allow presidential action, based on agency investigations, to take various actions, including import restrictions to address specific concerns (see text box). They have been used infrequently in the past two decades, in part due to the 1995 creation of the World Trade Organization (WTO) and its enforceable dispute settlement system."
CRS Insight, IN10943
Congressional Research Service: https://crsreports.congress.gov/